https://d.puremagic.com/issues/show_bug.cgi?id=11859
Summary: Slow compilation with -O with dmd
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody puremagic.com
ReportedBy: bearophile_hugs eml.cc
--- Comment #0 from bearophile_hugs eml.cc 2014-01-02 08:44:38 PST ---
Created an attachment (id=1309)
Program that produces a textual representation of the Mandelbrot set.
The very C-style program in attach compiles in less than 0.4 seconds with "dmd
-release -noboundscheck" (dmd 2.064), but it takes more than one hour (I have
measured about 68 minutes on the same PC) if I add the "-O" switch.
The same program with ldc2 "ldmd2 -release -noboundscheck" compiles in about
1.9 seconds, and in 6.9 seconds if I add "-O". (and the runtime of this
ldc2-compile is almost half as the optimized dmd-compile).
A very similar C program is compiled by GCC 4.8 with "gcc -O3" in about 6.7
seconds.
So I think there is some problem in dmd with -O.
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but it takes more than one hour (I have
measured about 68 minutes on the same PC) if I add the "-O" switch.
The same program with ldc2 "ldmd2 -release -noboundscheck" compiles in about
1.9 seconds, and in 6.9 seconds if I add "-O".